Answer:13 ft/s
Step-by-step explanation:
Given
Balloon velocity is 2 ft/s upwards
Distance between balloon and cyclist is 70 ft
Velocity of cyclist is 19 ft/s
After 3 sec
cyclist traveled a distance of

Distance traveled by balloon in 3 s

net height of balloon from ground =6+70=76 ft[/tex]
at

distance between cyclist and balloon is


now suppose at any time t cyclist cover a distance of x m and balloon is at a height of h m
thus

differentiating w.r.t time



